For me i’m glad the tracks have been ditched, I thought the 900 was overly complicated and the impact sound was far too loud, ( just a personal view, I prefer a more muted sound) these, plus the numbers, were the main reasons I rejected the 900 on test.
The key to this driver (as with any driver really) is going to be the shafts, with my M1 changing the HZRDUS yellow to the heavier black shaft (75g) has transformed my numbers, now straighter and longer than the yellow, talking to the fitter at our recent fitting day, he said it was possible to swap my HZRDUS black into the ST180 with a “universal” adapter, what I don’t know yet is HZRDUS are going to be a custom shaft option ? Any info on this would be welcome.
And I still hate the look of the M1 !!!!